In this paper, we present some results on GPRS physical- layer performance based on a GPRS simulator. The simulator strictly abides by the GSM standards implementing the detailed transmission chain. We analyze the results of a comprehensive simulation of the GPRS traffic channels. We evaluate the GPRS performance under various environment and service rates. The reference channel model used for the simulations is entirely based on the Ricean channel model and provides a reasonable scenario for radio propagation. The results shown here provide an insight into how to assess the actual GPRS data channels performance under various service rates.